Magnetic pattern



AugA 14', 192s.

F. R. CRA|G Er AL IAGHETIC PATTERN 2 Sheets-Sheet 1 Filed Dec.v 11, 1926 4 www# w3,

Y F. R. CRAIG ET AL l manana PATTERN Filed neg. 11,- 192e 2 sheets-suntl z,

Z5" L l y ,27 :L1 jZ5 *lll l Patented Aug. 14, 1928.

UNITED STATES PATENT OFFICE.

FINIs n. CRAIG A NDVJOHN J'. OLING, OP HARVEY, ILLINOIS, As'sIGNoRs To PRODUC- TION PATTERN COMPANY, OP HARVEY, ILLINOIS, A coRPOaATION OP ILLINOIS.

MAGNETIC PATTERN.

Application aiea'neeember 11, 192e. serial No. 154,177.'

`Our invention relates to a. magnetic pattern and a method of using the same, particularly in the molding of signs, such as `str-eet signs and the like. One object of our invention is tov provide a pattern which ,may be permanently mounted on a molding plate` and have the portions whichneed to be changed for diderent pieces of Work readily `detachable therefrom so that the attern itself `may be quickly changed to orm diderent types yof `sIgns.

`Another object of our invention is to pro` vide meansby which theymovable parts of this pattern, after being adjusted/to the pro er position, will be held rigidly In place so t at they will not be knocked out of place by ramming the sandV down around the pattern in the mold lask. A .Another objectof our invention is to provide a pattern o the above character, together.` withfa methodv of using the .sa-me whereby it is' only necessary to provide a single half-section pattern to form a mold for a complete sign having legend characters on Athe op osite sides thereof.

Other o )jects and advantages will appear as the description proceeds, when taken In Connection with the accompanying drawings.

3U However, we wish it to be distinctly understood that we. do vnot intend to limit ourselves to the exact details shown and described, but that we intend to avail' ourselves of allvsuch modifications as would occur to one skilled in the art and wouldl fall within the, scope ofthe claims;

In the'drawingszy y Fig. 1 is a plan view of our improved pattern;

Fig. 2 is an enlarged sectional View on the line`2-2 of Fig.` 1;

Fig. 3 is a side view nofthe pattern and the support therefor and Fig. 4 is a plan view of an inverted mold flask showingy the impression left by our pattern in the `sand of the flask.

Referringr now` in detail to the drawings, the numeral 5 represents a base plate which may be supported any suitable manner,` and whichis preferably constructed of some.A

nonmagnetic material. Secured ontop of thev base plate 1s' the patternV kmember Y 6,

which, asshown wiu Figs. 1, andI 2, extends substantially .the full length of the base plate and has raised top and bottom rim portions to form the outline of the sign. llxtending lengthwise of the member 6, which is preferably of l.non-magnetic material, lare the two bars 7 and 8 of magnetic iron. These bars, as shown' in Fig. 2, are of the same thickness as the vmember 6 and have the top, and bottom 'faces thereof exposed. Centrally of the member 6 are' the supporting member 9, which vis' preferably formed integrally therewith, and the top member 10 for the sign.

Sometimes in making the signs it is prefcrable to make a sign plate with a supporting member as at 9 and a socket member at the place shown as occupied Vby V10.` For this reason the member l() is made detachable and is held against the base plate. 5

byl means of a screw 11, so that it may be taken off and other members applied.

The legend members of the sign areV indicated by the vnumeral 12, and' are also formed of magnetic iron so that they may be attracted by the irons bars 7 and 8. Means are provided wherebyrthe bars 7 and 8 may be magnetized. This means consists of electro-magnets having the cores 13 and 14 V.projecting upwardly through the plate 5 into engagement with the bars 7 and 8. These cores are connected at their lower ends by the/cross piece 15 and are wound, as shownL diagrammati'cally inFig'. 2, so as to have an opposite polarity7 at their upper ends. The windings for the two magnets are preferably in" series, and may be connected to any suitable source of electric power. `It is obvious'thatan electro-magnet is not the only type ythat could be used for this purpose,but if permanent magnets were used they would necessarily have to be recharged at intervals, and are therefore not so' wellV adapted for this use as the velectromagnet shown.

lCross bar 15 forcesthe cores 1.3 andltupwardly against the iron bars inthe pattern, and these coresare adjustably supported by screw 16 in the horizontal portion of the U-shaped member 17,'the legs 18 and 190i` which extend upwardly and are secured in thebracket's 2v0landv 21 depending from the base plate 5. With this structure, it is apparent that the core members 13 and 14 may be properly adjusted at all times so as to hold them against the iron bars 7 and 8, or ii desired to replace them, they may be lowered and removed endwise from the base plate.

The legend characters 12 in the building up of theV pattern are preferably arranged from the center line of the member G outwardly toward each end, the characters being equally spaced on opposite sides of the center line so that the number of characters in a name will determine the length of' the sign. In order to cut off the pattern at the opposite ends of the legend construction, we provide the sand core members 22, which are spacedequally from the opposite ends of the legend so that their `distance from the center or" the member 6 may be the same. This is highly important in the properuse of this pattern, as will presently appear.

After the pattern has been built up to lts complete form, the molding flask 23 is placed overthe pattern and filled with sand. This flask has the projecting ears 24 and Q5 at opposite ends thereof, the ear 24 being provided with a pin 2G adapted to engage an` opening 28 in the end of the plate 5, and the ear 25 is provided with an opening 27 through which the pin 29 projecting upwardly from the plate 5k extends. Thus it will be seen that the mold flask is always properly positioned with respect to the pattern.

The flask is now filled with sand and the sand rammed down in any suitable manner, by a suitable means, which is not shown here, since it forms no part of our invention. After the sand has been rammed down, the base plate is vibrated by a suitable vibration (not shown) v to loosen the sand and the flask is removed, and upon be- It is simply ing turned over endwise presents the appearance shown in Fig. 4:, wherein the impression of our improved pattern is illustrated. This mold, therefore, forms onehall of the complete mold Vfor a sign.

Now, in order to forni the other half of the mold, we leave thepattern in the same position and apply a second flask in the same manner as the first, and this flask, after ramming down the sand, isremoved from the pattern, but is not turned wrong side up. placed on the first flask so that the pin thereon will engage the opening in 'the ear provided in the first flask removed, and the opening inthe opposite end from the pin will be engaged by the pin removed with the first flasl Thus it will be seen that by this placing of the flasks the legend characters in the second mold now read in the opposite direction to what those provided in the first mold do, and when the two molds are placed together a complete mold for the sign results,

and since'the two half molds are-made from the same pattern and were centered with respect to the flasks, they will coincide, and when filled with the molten metal a finished sign having the raised characters on opposite sides thereof will be formed.

It is thought that thc above description of the structure and the operation of our device will make it clear, and from this description it will be seen that we have provided a magnetic pattern which may be permanently mounted on a base plate and have the movable parts thereof' interchanged readily to form any desired legend without in any way necessitating a complete change of' pattern. I `urthermore, with the method of using this pattern as set out above, it is possible to form a complete mold with only half a pattern as patterns are generally understood, since we perform by manipulation of the pattern characters and the mold flasks a certain operation whereby the singley half pattern may form an impression in two flasks and these two impressions placed together form the mold.

Having thus described our invention, what we claimV and' desire to secure by Letters Patent is: A 1. A magnetic pattern device for forming an impression in a mold comprising a body portion, having a pair of spaced bars of magnetic metal thereon, a magnet for charging said bars, and pattern parts of magnetic metal extending across said bars and held in place by the magnetic attraction of said bars. y

2. A device of the character described for forming impressions in molds comprising a base plate for supporting a molding flask, a pattern body secured thereon, said body having a portion thereof of magnetic metal, electro-magnetic means for charging said magnetic metal portion, and magnetic metal pattern parts detachably held on said pattern body byssaid charged magnetic metal portion.`

3. A device of the character described for forming impressions in molds comprising ar base plate for supporting a molding flask, a pattern body rigidly secured thereon, said body having a portion thereof of magnetic metal, electro-magnetic means for charging said magnetic metal portion. and magnetic metal pattern parts detachably held on said pattern body by engagement with said charged magnetic metal portion.

el. magnetic pattern device for forming an impression in a mold comprising a body portion, having a pair of spaced bars of magnetic metal embedded therein, electromagnetic means for charging said bars, and

pattern parts of magnetic metal extending across said bars and held in place by the magnetic attraction of said bars.

v5. A device of the character described for forming impressions in molds comprising a base plate for supporting a molding flask, a patternv body secured thereon, said body having a portion thereof of magnetic metal, magnets supportedbeneath said base plate for charging said magnetic metal portion, and magnetic metal pattern parts detachably held on said pattern body by said charged magnetic metal portion.

6. A magnetic pattern device for forming an impression in a mold comprising a body portion, having a.l pair of spaced bars of magnetic metal thereon, a plurality ot inagnets engaging .said bars, and pattern parts ot' magnetic metal extending across said bars and held in place by the magnetic attraction of said bars.

7. A device of the character described for forming impressions in molds comprising a base plate for supporting a molding flask, a pattern body thereon, said body having a pair of spaced magnetic metal portions eX- tending therethrough, electro-magnets car# ried by said base plate for charging said portions and pattern parts of magnetic metal for completing the pattern extending over said spaced magnetic metal portions and held in place bythe magnetic attraction of said portions.

8. A device of the character described for forming impressions in molds comprising a base plate for supporting a molding iiask, a pattern body thereon, said body having a pair of spaced magnetic metal portions extending therethrough, electrowmagnets supported beneath said base plate and projecting upwardly therethrough for charging said portions and pattern parts of magnetic metal for completing the pattern extending over said spaced magnetic metal portions and held in place by the magnetic attraction of said portions.

9. A magnetic sign pattern for 'forming an impression in a mold comprising an elongated body portion having a pair of spaced magnetic metal bars extending from end to end thereof, means tor magnetizing said bars and legend characters ot' magnetic metal each engaging both of said bars and held in place thereby to form the complete.

pattern.

In Witness whereof, We hereunto subscribe our names this 17` day ot November A. D., 1926.

FINIS R. CRAIG. JOHN J. OLINGr.v 

